1
BIOL 1009 - PRACTICE EXAM 2026/2027 |
EXAM PREP | 200 VERIFIED Q&A | DETAILED
RATIONALES | NGN-ALIGNED | PASS
GUARANTEED – A+ GRADED
SECTION I: SCIENTIFIC METHOD AND BASIC CHEMISTRY - Questions 1-20
Q1: Hypothesis
The student is reviewing the scientific method. What is a hypothesis?
A. A proven fact
B. A testable prediction
C. A final conclusion
D. A random guess
Correct Answer: B
Rationale: A hypothesis is a testable prediction based on observations. It must be falsifiable and is
tested through experimentation. [100% CORRECT]
Q2: Independent variable
The student is reviewing experimental design. What is the independent variable?
A. The variable measured
B. The variable manipulated
C. The variable kept constant
D. The control group
Correct Answer: B
Rationale: The independent variable is the factor that the researcher changes or manipulates. The
dependent variable is measured. [100% CORRECT]
Q3: Dependent variable
The student is reviewing experimental design. What is the dependent variable?
A. The variable manipulated
B. The variable measured
C. The variable kept constant
D. The experimental group
Correct Answer: B
Rationale: The dependent variable is what is measured or observed in response to changes in the
independent variable. [100% CORRECT]
,2
Q4: Control group
The student is reviewing experimental design. What is the purpose of a control group?
A. To test the independent variable
B. To provide a baseline for comparison
C. To receive the experimental treatment
D. To increase sample size
Correct Answer: B
Rationale: The control group does not receive the experimental treatment and provides a baseline
to compare against the experimental group. [100% CORRECT]
Q5: Scientific theory
The student is reviewing scientific theories. What is a scientific theory?
A. A guess
B. A well-supported explanation
C. A hypothesis
D. An observation
Correct Answer: B
Rationale: A scientific theory is a well-supported explanation of natural phenomena, based on
extensive evidence and tested repeatedly. [100% CORRECT]
Q6: Atomic structure
The student is reviewing atomic structure. What are the three main subatomic particles?
A. Protons, neutrons, electrons
B. Atoms, molecules, ions
C. Acids, bases, salts
D. Elements, compounds, mixtures
Correct Answer: A
Rationale: Atoms consist of protons (positive), neutrons (neutral), and electrons (negative). Protons
and neutrons are in the nucleus; electrons orbit. [100% CORRECT]
Q7: Atomic number
The student is reviewing atomic structure. What is the atomic number?
A. Number of neutrons
B. Number of protons
C. Number of electrons
D. Atomic mass
,3
Correct Answer: B
Rationale: The atomic number equals the number of protons in an atom. It defines the element's
identity. [100% CORRECT]
Q8: Isotopes
The student is reviewing isotopes. What are isotopes?
A. Atoms with different numbers of protons
B. Atoms with different numbers of neutrons
C. Atoms with different numbers of electrons
D. Ions
Correct Answer: B
Rationale: Isotopes are atoms of the same element with different numbers of neutrons, giving
different atomic masses. [100% CORRECT]
Q9: Ionic bond
The student is reviewing chemical bonds. What is an ionic bond?
A. Sharing electrons
B. Transfer of electrons
C. Weak attraction
D. Hydrogen bond
Correct Answer: B
Rationale: Ionic bonds form when one atom transfers electrons to another, creating oppositely
charged ions that attract. [100% CORRECT]
Q10: Covalent bond
The student is reviewing chemical bonds. What is a covalent bond?
A. Transfer of electrons
B. Sharing of electron pairs
C. Weak attraction
D. Ionic attraction
Correct Answer: B
Rationale: Covalent bonds involve the sharing of electron pairs between atoms. They can be polar or
nonpolar. [100% CORRECT]
Q11: Hydrogen bond
The student is reviewing chemical bonds. What is a hydrogen bond?
A. Strong covalent bond
B. Weak attraction between polar molecules
, 4
C. Ionic bond
D. Metallic bond
Correct Answer: B
Rationale: Hydrogen bonds are weak attractions between a partially positive hydrogen and a
partially negative atom like oxygen or nitrogen. [100% CORRECT]
Q12: Water polarity
The student is reviewing water. Why is water a polar molecule?
A. It has equal charge
B. It has partial positive and negative ends
C. It is nonpolar
D. It has no charge
Correct Answer: B
Rationale: Water is polar because oxygen is more electronegative than hydrogen, creating partial
negative and positive ends. [100% CORRECT]
Q13: Cohesion
The student is reviewing water properties. What is cohesion?
A. Attraction between water molecules
B. Attraction between water and other molecules
C. Water dissolving substances
D. Water changing temperature
Correct Answer: A
Rationale: Cohesion is the attraction between water molecules due to hydrogen bonding, creating
surface tension. [100% CORRECT]
Q14: Adhesion
The student is reviewing water properties. What is adhesion?
A. Attraction between water molecules
B. Attraction between water and other surfaces
C. Water dissolving substances
D. Water freezing
Correct Answer: B
Rationale: Adhesion is the attraction between water molecules and other surfaces, important for
capillary action. [100% CORRECT]
Q15: pH scale
The student is reviewing pH. A solution with pH 4 is:
A. Acidic
BIOL 1009 - PRACTICE EXAM 2026/2027 |
EXAM PREP | 200 VERIFIED Q&A | DETAILED
RATIONALES | NGN-ALIGNED | PASS
GUARANTEED – A+ GRADED
SECTION I: SCIENTIFIC METHOD AND BASIC CHEMISTRY - Questions 1-20
Q1: Hypothesis
The student is reviewing the scientific method. What is a hypothesis?
A. A proven fact
B. A testable prediction
C. A final conclusion
D. A random guess
Correct Answer: B
Rationale: A hypothesis is a testable prediction based on observations. It must be falsifiable and is
tested through experimentation. [100% CORRECT]
Q2: Independent variable
The student is reviewing experimental design. What is the independent variable?
A. The variable measured
B. The variable manipulated
C. The variable kept constant
D. The control group
Correct Answer: B
Rationale: The independent variable is the factor that the researcher changes or manipulates. The
dependent variable is measured. [100% CORRECT]
Q3: Dependent variable
The student is reviewing experimental design. What is the dependent variable?
A. The variable manipulated
B. The variable measured
C. The variable kept constant
D. The experimental group
Correct Answer: B
Rationale: The dependent variable is what is measured or observed in response to changes in the
independent variable. [100% CORRECT]
,2
Q4: Control group
The student is reviewing experimental design. What is the purpose of a control group?
A. To test the independent variable
B. To provide a baseline for comparison
C. To receive the experimental treatment
D. To increase sample size
Correct Answer: B
Rationale: The control group does not receive the experimental treatment and provides a baseline
to compare against the experimental group. [100% CORRECT]
Q5: Scientific theory
The student is reviewing scientific theories. What is a scientific theory?
A. A guess
B. A well-supported explanation
C. A hypothesis
D. An observation
Correct Answer: B
Rationale: A scientific theory is a well-supported explanation of natural phenomena, based on
extensive evidence and tested repeatedly. [100% CORRECT]
Q6: Atomic structure
The student is reviewing atomic structure. What are the three main subatomic particles?
A. Protons, neutrons, electrons
B. Atoms, molecules, ions
C. Acids, bases, salts
D. Elements, compounds, mixtures
Correct Answer: A
Rationale: Atoms consist of protons (positive), neutrons (neutral), and electrons (negative). Protons
and neutrons are in the nucleus; electrons orbit. [100% CORRECT]
Q7: Atomic number
The student is reviewing atomic structure. What is the atomic number?
A. Number of neutrons
B. Number of protons
C. Number of electrons
D. Atomic mass
,3
Correct Answer: B
Rationale: The atomic number equals the number of protons in an atom. It defines the element's
identity. [100% CORRECT]
Q8: Isotopes
The student is reviewing isotopes. What are isotopes?
A. Atoms with different numbers of protons
B. Atoms with different numbers of neutrons
C. Atoms with different numbers of electrons
D. Ions
Correct Answer: B
Rationale: Isotopes are atoms of the same element with different numbers of neutrons, giving
different atomic masses. [100% CORRECT]
Q9: Ionic bond
The student is reviewing chemical bonds. What is an ionic bond?
A. Sharing electrons
B. Transfer of electrons
C. Weak attraction
D. Hydrogen bond
Correct Answer: B
Rationale: Ionic bonds form when one atom transfers electrons to another, creating oppositely
charged ions that attract. [100% CORRECT]
Q10: Covalent bond
The student is reviewing chemical bonds. What is a covalent bond?
A. Transfer of electrons
B. Sharing of electron pairs
C. Weak attraction
D. Ionic attraction
Correct Answer: B
Rationale: Covalent bonds involve the sharing of electron pairs between atoms. They can be polar or
nonpolar. [100% CORRECT]
Q11: Hydrogen bond
The student is reviewing chemical bonds. What is a hydrogen bond?
A. Strong covalent bond
B. Weak attraction between polar molecules
, 4
C. Ionic bond
D. Metallic bond
Correct Answer: B
Rationale: Hydrogen bonds are weak attractions between a partially positive hydrogen and a
partially negative atom like oxygen or nitrogen. [100% CORRECT]
Q12: Water polarity
The student is reviewing water. Why is water a polar molecule?
A. It has equal charge
B. It has partial positive and negative ends
C. It is nonpolar
D. It has no charge
Correct Answer: B
Rationale: Water is polar because oxygen is more electronegative than hydrogen, creating partial
negative and positive ends. [100% CORRECT]
Q13: Cohesion
The student is reviewing water properties. What is cohesion?
A. Attraction between water molecules
B. Attraction between water and other molecules
C. Water dissolving substances
D. Water changing temperature
Correct Answer: A
Rationale: Cohesion is the attraction between water molecules due to hydrogen bonding, creating
surface tension. [100% CORRECT]
Q14: Adhesion
The student is reviewing water properties. What is adhesion?
A. Attraction between water molecules
B. Attraction between water and other surfaces
C. Water dissolving substances
D. Water freezing
Correct Answer: B
Rationale: Adhesion is the attraction between water molecules and other surfaces, important for
capillary action. [100% CORRECT]
Q15: pH scale
The student is reviewing pH. A solution with pH 4 is:
A. Acidic
